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Other Expense, Income and Non-Operating Other Income, Net - Schedule of Other Income and Non-Operating Other Income, Net (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Other expense:        
Realized and unrealized losses on contractual obligations associated with carbon credits       $ 1,634 $ 546
Losses on sales and disposals of property and equipment 406 677 1,414 677
Dismantle and demolition expense    264 559 2,364
Miscellaneous penalties 3 10 6 806
Miscellaneous expense 58    181 314
Total other expense 467 951 3,794 4,707
Other income:        
Realized and unrealized gains on carbon credits       1,925 546
Settlements of litigation and potential litigation          545
Gain (losses) on sales and disposals of property and equipment    (179)      
Miscellaneous income 162 349 451 624
Total other income 162 170 2,376 1,715
Other expense, net 305 781 1,418 2,992
Non-operating other expense (income), net:        
Interest income (88) (52) (262) (64)
Miscellaneous income            
Miscellaneous expense (1) 18 20 54
Total non-operating other income, net $ (89) $ (34) $ (242) $ (10)